One vertex per element, one color per generator, with an edge from x to x·s.
(5,6,9,10)(7,11,8,12)(13,14,19,15)(16,23,25,24)(17,27,21,18)(20,28,22,26)(1,2)(3,4)(6,10)(11,12)(13,15,19,14)(16,24,25,23)(17,18,21,27)(20,26,22,28)(5,7,9,8)(6,11,10,12)(13,16,18,26,19,25,27,28)(14,20,21,23,15,22,17,24)(2,4)(13,17,18,14,19,21,27,15)(16,23,26,22,25,24,28,20)(5,8,9,7)(6,11,10,12)(16,25)(20,22)(23,24)(26,28)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.